RE: Suggestion on Engine for MK Skystar 90
You could also look at the Webra .80. It is a rear exhaust 2-stroke. A bit pricey. Jon Wold put one in his - check for the thread here in the pattern forum. I have a NIB Hanno Special for mine. The Skystar can be built quite light.
MK Kits are great - enjoy,
Will B.